Steely Blue vs Deep Sky

How close are they?

ΔE 11.6, fair: the same colour family, but not a straight swap. Deep Sky is a little lighter, more saturated, warmer than Steely Blue.

Can I use Deep Sky instead of Steely Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Deep Sky is a little lighter, more saturated, warmer than Steely Blue.

Can I use Steely Blue instead of Deep Sky?

The same difference applies the other way round: Steely Blue is a little darker, more muted, cooler.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.